Given that most people that seem/are capable of creating any game on the Amiga seem/are more into discussing how to do it rather than doing it and/or simply giving up somewhere along the way, I'd say...

If you order the Humble Monthly bundle for February you'll get Alien: Isolation right away. That's 12$ for Alien: Isolation and at least 5 more games in the actual bundle. You can easily unsubscribe...